Q: 64-bit PCI - 66 Mhz vs 33 Mhz networking performance?

Pedro Díaz Jiménez pdiaz88 at terra.es
Tue Jul 3 21:47:02 EDT 2001


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On Tuesday 03 July 2001 22:20, Patrick Geoffray wrote:
> Hi Wes,
>
> W Bauske wrote:
> > That's interesting. Do you by chance have numbers for ServerWorks
> > and say, a 32bit PCI config? Just curious how bad 150MB/sec is.
> > For what I do, that would be more than enough.
>
> You need to keep in mind the (theor.) peak of the PCI bus :
> * 32 bits/33 Mhz : aggregated ideal peak at 132 MB/s
> * 64 bits/33 Mhz : aggregated ideal peak at 264 MB/s
> * 64 bits/66 Mhz : aggregated ideal peak at 528 MB/s
>
> On a Intel 440GX 32/33 :
> ================================
>
> DMA rate for 4096 Byte transfers (32bit / 33MHz bus)
> 1st: 8 pages from bogus sdma pg, 8 to bogus rdma
>         bus_read  (send) = 128 MBytes/s
>         bus_write (recv) = 128 MBytes/s
>
> DMA rate for 4096 Byte transfers (32bit / 33MHz bus)
> 2nd: sdma a page, rdma a page 8 times
>         bus_read  (send) = 128 MBytes/s
>         bus_write (recv) = 128 MBytes/s
>
> DMA rate for 4096 Byte transfers (32bit / 33MHz bus)
> 3rd: sdma and rdma to/from alternating pages (coarse grain)
>         bus_read  (send) = 128 MBytes/s
>         bus_write (recv) = 128 MBytes/s
>
> DMA rate for 4096 Byte transfers (32bit / 33MHz bus)
> 4th: sdma and rdma to/from alternating pages (fine grain)
>         bus_read  (send) = 128 MBytes/s
>         bus_write (recv) = 128 MBytes/s
>
> => that's good (Intel chipsets are not bad for 32/33)
>
>
> On ServerWorks 64/66 (LE):
> ==========================
>
> DMA rate for 4096 Byte transfers (64bit / 66MHz bus)
> 1st: 8 pages from bogus sdma pg, 8 to bogus rdma
>         bus_read  (send) = 455 MBytes/s
>         bus_write (recv) = 512 MBytes/s
>
> DMA rate for 4096 Byte transfers (64bit / 66MHz bus)
> 2nd: sdma a page, rdma a page 8 times
>         bus_read  (send) = 455 MBytes/s
>         bus_write (recv) = 512 MBytes/s
>
> DMA rate for 4096 Byte transfers (64bit / 66MHz bus)
> 3rd: sdma and rdma to/from alternating pages (coarse grain)
>         bus_read  (send) = 455 MBytes/s
>         bus_write (recv) = 512 MBytes/s
>
> DMA rate for 4096 Byte transfers (64bit / 66MHz bus)
> 4th: sdma and rdma to/from alternating pages (fine grain)
>         bus_read  (send) = 455 MBytes/s
>         bus_write (recv) = 512 MBytes/s
>
> => Well, compare it to the i860. But be carefull, some ServerWorks
> chipsets are not so good.
> For example the HE-LE (64/66) :
> ================================
>
> DMA rate for 4096 Byte transfers (64bit / 66MHz bus)
> 1st: 8 pages from bogus sdma pg, 8 to bogus rdma
>         bus_read  (send) = 315 MBytes/s
>         bus_write (recv) = 372 MBytes/s
>
> DMA rate for 4096 Byte transfers (64bit / 66MHz bus)
> 2nd: sdma a page, rdma a page 8 times
>         bus_read  (send) = 315 MBytes/s
>         bus_write (recv) = 372 MBytes/s
>
> DMA rate for 4096 Byte transfers (64bit / 66MHz bus)
> 3rd: sdma and rdma to/from alternating pages (coarse grain)
>         bus_read  (send) = 315 MBytes/s
>         bus_write (recv) = 372 MBytes/s
>
> DMA rate for 4096 Byte transfers (64bit / 66MHz bus)
> 4th: sdma and rdma to/from alternating pages (fine grain)
>         bus_read  (send) = 315 MBytes/s
>         bus_write (recv) = 372 MBytes/s
>
>
> The best way to choose a machine is to bench the PCI bus before
> to buy, ask from a loan from the vendor.
>
> A good idea would be to collect PCI performances from different
> motherboards (and different chipsets) and put them on a website
> to help people to make their choice. If someone has some free
> time...

I have the space, the bandwitch and maybe the time. Do you think 
planetcluster.org, hardware section, is a good site?

Any volunteers for collecting the data?

Regards

Pedro


>
> -----------------------------------------------------------
>
> |   Patrick Geoffray, Ph.D.      patrick at myri.com         |
> |   Myricom, Inc.                http://www.myri.com      |
> |   Cell: 865-389-8852           325 N. Santa Anita Ave.  |
> |   Fax:  865-974-1950           Arcadia, CA 91006        |
>
> -----------------------------------------------------------
>
>
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- -- 

  __________________________________________________
 /                                                  \
 | Pedro Diaz Jimenez                               |
 |                                                  |
 | pdiaz88 at terra.es      pdiaz at acm.asoc.fi.upm.es   |
 |                                                  |
 |                                                  |
 | http://planetcluster.org                         |
 | Clustering & H.P.C. news and documentation       |
 |                                                  |
 | There are no stupid questions, but there's a lot |
 | of inquisitve idiots                             |
 |        Anonymous                                 |
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